this error appeared as welll for multipath:
[ 35.698746] systemd-udevd[8149]: failed to execute '/lib/udev/socket:/org/kernel/dm/multipath_event' 'socket:/org/kernel/dm/multipath_event': No such file or directory.

I had the nividia binary driver and it has things like "HAL autodetects the screen" in X11/xorg.conf. My screen went to 640x480 and I tried to install the nouveau drivers. I also tried to disable KMS with 'nomodset'. I did purge hal as instructed, but every time I reboot, I get a 640x480 X11 screen. It is hard to find a solution on the Internet with this screen resolution. Is this related or do I have a completely different issue?

Each individual line works with 'modprobe', but not nvidia. Then I have to run 'sudo /etc/init.d/lightdm restart' and then I have the nouveau drivers recognized. Now, you can look at '/var/log/Xorg.0.log' and see why your modes are rejected. Run through this link to manually add resolutions.

Lesson: Don't change to 'nouveau' from the 'nvidia binaries' if you hit this bug. If you did, then maybe the above helps. My display is still flakey; no doubt because of the modeline I have to cook up now.

In order to continue using Thoggen, upon updating to Saucy, I installed the old package and it's hal dependency. Then, I began having this issue as well. Rather than remove it as a "fix", I simply commented out the offending line in /lib/udev/rules.d/90-hal.rules

Would it be better to use Michael Blennerhassett's PPA version? I'm not sure what the included arch patches are for.